491 is a 1964Swedish black-and-white drama film directed by Vilgot Sjöman, based on a novel by Lars Görling. The story is about a group of youth criminals who are chosen to participate in a social experiment, where they are assigned to live together in an apartment while being supervised by two forgiving social workers. The tagline is: It is written that 490 times you can sin and be forgiven. This motion picture is about the 491st.

This controversial film, which featured a male homosexual rape scene, was first banned in Sweden and Malaysia, but released after reediting, a censored version was later released in Malaysia. Amongst other things, a scene in which a woman is raped by a dog was cut. The film was also banned in Norway until 1971. The reactions from especially conservative elements in Sweden were of disgust and outrage, and it was one of the reasons why the Christian Democratic Party was founded in 1964.